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A commercial kit (Cordia-IC) from Cordis Laboratory, Miami, Fla., was compared with the Raji cell radioimmunoassay for its ability to detect circulating immune complexes (CIC) in sera from 30 control subjects and 118 patients with infectious diseases. The 118 patients were categorized into the following groups: (i) 23 patients with bacterial endocarditis, (ii) 41 patients with bacteremia from an infected intravascular catheter or access device, and (iii) 54 patients with Staphylococcus aureus bacteremia related to a deep tissue infection. The Cordia-IC was comparable to the Raji cell radioimmunoassay in intraassay variability (4.0 versus 8.0%) and interassay reproducibility (8.7 versus 20.0%). Neither assay found CIC amounts above 12.5 micrograms equivalents (eq) of aggregated human gamma globulin (AHG) per ml in any of the 30 control individuals. In group 1, Cordia-IC detected 19 of 23 positives (mean, 73.6 micrograms eq of AHG per ml), whereas the Raji cell detected 16 of 23 positives (mean, 54.8 micrograms eq of AHG per ml). In group 2, Cordia-IC detected 19 of 41 positives (mean, 20.6 micrograms eq of AHG per ml), whereas the Raji cell detected 16 of 41 positives (mean, 15.1 micrograms eq of AHG per ml). In group 3, Cordia-IC found 38 of 54 positives (mean, 28.0 micrograms eq of AHG per ml), whereas the Raji cell found 32 of 54 positives (mean, 23.9 micrograms eq of AHG per ml). Statistically, these findings were not significantly different in any of the three patient groups (P&gt; 0.15), and there was an overall good correlation between the results obtained by the two assays (r+0.64, P&lt;0.001). The Cordia-IC provided a suitable assay for the detection of CIC and might find application in routine clinical laboratories.

Evaluation of a Cordia-IC enzyme-linked immunosorbent assay kit for the detection of circulating immune complexes